Difference between revisions of "Hypericum microsepalum"
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Hypericum microsepalum (obligate resprouter) was associated with upland, drier pine savannas where fires are frequent and typically burn uniformly across landscapes (2–3 year fire frequency). Hypericum species had habitat associations with different elevation categories along ecoclines. Hypericum microsepalum had positive associations with upland plots and negative associations with intermediate and lowland plots.<ref name="Crandall 2013">Crandall, R. M. and W. J. Platt (2012). "Habitat and fire heterogeneity explain the co-occurrence of congeneric resprouter and reseeder Hypericum spp. along a Florida pine savanna ecoline." Plant Ecology 213: 1643-1654.</ref> Found in Pine savanna and seepage bog community types of Florida.<ref name="Drewa et al 2002">Drewa, P., W. Platt, et al. (2002). "Community Structure along Elevation Gradients in Headwater Regions of Longleaf Pine Savannas." Plant Ecology 160(1): 61-78.</ref> H. microsepalum is one of the most abundant seepage savanna shrubs that resprout from root crowns.<ref name="Drewa et al 2006">Drewa, P. B., J. M. Thaxton, et al. (2006). "Responses of root-crown bearing shrubs to differences in fire regimes in Pinus palustris (Longleaf pine) savannas: exploring old-growth questions in second-growth systems." Applied Vegetation Science 9: 27-36.</ref> | Hypericum microsepalum (obligate resprouter) was associated with upland, drier pine savannas where fires are frequent and typically burn uniformly across landscapes (2–3 year fire frequency). Hypericum species had habitat associations with different elevation categories along ecoclines. Hypericum microsepalum had positive associations with upland plots and negative associations with intermediate and lowland plots.<ref name="Crandall 2013">Crandall, R. M. and W. J. Platt (2012). "Habitat and fire heterogeneity explain the co-occurrence of congeneric resprouter and reseeder Hypericum spp. along a Florida pine savanna ecoline." Plant Ecology 213: 1643-1654.</ref> Found in Pine savanna and seepage bog community types of Florida.<ref name="Drewa et al 2002">Drewa, P., W. Platt, et al. (2002). "Community Structure along Elevation Gradients in Headwater Regions of Longleaf Pine Savannas." Plant Ecology 160(1): 61-78.</ref> H. microsepalum is one of the most abundant seepage savanna shrubs that resprout from root crowns.<ref name="Drewa et al 2006">Drewa, P. B., J. M. Thaxton, et al. (2006). "Responses of root-crown bearing shrubs to differences in fire regimes in Pinus palustris (Longleaf pine) savannas: exploring old-growth questions in second-growth systems." Applied Vegetation Science 9: 27-36.</ref> | ||
===Phenology=== <!--Timing off flowering, fruiting, seed dispersal, and environmental triggers. Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ --> | ===Phenology=== <!--Timing off flowering, fruiting, seed dispersal, and environmental triggers. Cite PanFlora website if appropriate: http://www.gilnelson.com/PanFlora/ --> | ||
| + | Flowering and fruiting has been observed in January through May, as well as in July (FSU Herbarium). | ||
| + | |||
===Seed dispersal=== | ===Seed dispersal=== | ||
All species produce perfect flowers and dehiscent, septicidal capsules containing numerous seeds. Seeds are dispersed by gravity and occasionally by birds (Robson 2003).<ref>citations needed</ref> | All species produce perfect flowers and dehiscent, septicidal capsules containing numerous seeds. Seeds are dispersed by gravity and occasionally by birds (Robson 2003).<ref>citations needed</ref> | ||
Revision as of 12:43, 20 July 2015
| Hypericum microsepalum | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta - Flowering plants |
| Class: | Magnoliopsida – Dicotyledons |
| Order: | Theales |
| Family: | Clusiaceae ⁄ Guttiferae |
| Genus: | Hypericum |
| Species: | H. microsepalum |
| Binomial name | |
| Hypericum microsepalum (Torr. & A. Gray) A. Gray ex S. Watson | |
| |
| Natural range of Hypericum microsepalum from USDA NRCS Plants Database. | |
Contents
Description
Common Name: flatwoods St. Johnswort
Synonym Name: Crookea microsepala (Torr. & A. Gray) Small
Hypericum microsepalum is an evergreen, arborescent plant that occurs along coastal ecoclines of the Florida panhandle (nomenclature follows Godfrey 1988).[1]
Distribution
Ecology
Hypericum microsepalum and H. brachyphyllum are shrubby in habit, producing multiple shoots from the base, whereas H. chapmanii produces a single stem with thick, flaky bark (Godfrey 1988; Robson 2003).[2] Hypericum microsepalum, in particular, has high survival when transplanted in lowland areas, but the populations quickly decline in the absence of fire.[3]
Habitat
Hypericum microsepalum (obligate resprouter) was associated with upland, drier pine savannas where fires are frequent and typically burn uniformly across landscapes (2–3 year fire frequency). Hypericum species had habitat associations with different elevation categories along ecoclines. Hypericum microsepalum had positive associations with upland plots and negative associations with intermediate and lowland plots.[3] Found in Pine savanna and seepage bog community types of Florida.[4] H. microsepalum is one of the most abundant seepage savanna shrubs that resprout from root crowns.[5]
Phenology
Flowering and fruiting has been observed in January through May, as well as in July (FSU Herbarium).
Seed dispersal
All species produce perfect flowers and dehiscent, septicidal capsules containing numerous seeds. Seeds are dispersed by gravity and occasionally by birds (Robson 2003).[6]
Seed bank and germination
All species have life spans 10 years and persistent seed banks.[3]
Fire ecology
“Biennial dormant and growing season fires affected Hypericum microsepalum. Stem densities were eight times greater after dormant season than growing season fires, but not significantly (P = 0.218). They also changed with time (P < 0.001), and were affected by treatment interactions (P = 0.039). Densities were 5 times greater after a first set of dormant season than growing season fires, but responses were variable (P = 0.258; Fig. 1b). Compared to initial levels, densities were 7 times greater after repeated dormant season fires (P < 0.001). After biennial growing season fires, densities were similar to those initially (P = 0.654). Densities were 13 times greater after repeated dormant season than growing season fires; this difference was not significant (P =0.060).”[5]
Pollination
Use by animals
Diseases and parasites
Conservation and Management
Cultivation and restoration
Photo Gallery
References and notes
Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2014.
Collectors: John Jensen, Carl Noedman, Preston Adams, Robert K. Godfrey. Sidney McDaniel, Mark A Garland, Preston Adams, Walter S. Judd, Kent D. Perkins, Scott Zona, Loran C. Anderson, William P. Adams, Robert Kral, H. E. Grelen, M. Knott, L. B. Trott, Steve L. Orzell, M. Davis, K. M. Meyer, and A. Townesmith.
States and Counties: Florida: Bay, Calhoun, Dixie, Franklin, Gulf, Jackson, Jefferson, Lafayette, Liberty, Madison, Marianna, Okaloosa, Santa Rosa, Taylor, Wakulla, and Walton. Georgia: Thomas.
- ↑ citations needed
- ↑ citations needed
- ↑ 3.0 3.1 3.2 Crandall, R. M. and W. J. Platt (2012). "Habitat and fire heterogeneity explain the co-occurrence of congeneric resprouter and reseeder Hypericum spp. along a Florida pine savanna ecoline." Plant Ecology 213: 1643-1654.
- ↑ Drewa, P., W. Platt, et al. (2002). "Community Structure along Elevation Gradients in Headwater Regions of Longleaf Pine Savannas." Plant Ecology 160(1): 61-78.
- ↑ 5.0 5.1 Drewa, P. B., J. M. Thaxton, et al. (2006). "Responses of root-crown bearing shrubs to differences in fire regimes in Pinus palustris (Longleaf pine) savannas: exploring old-growth questions in second-growth systems." Applied Vegetation Science 9: 27-36.
- ↑ citations needed
